Аннотация:This paper proposes a method and an algorithm for piecewise constant signal reconstruction by the registration result obtained by device, the effect of which can be described by a linear operator (blur) and an additive noise. The form of the linear operator and statistical properties of the noise are known. The range of the piecewise constant signal is also assumed to be given. The investigation of the piecewise constant signal reconstruction accuracy dependence on the number of possible signal values was carried out.